Toothed cutter lip



Aug. 5, 1924. 1,503,866

H. G. WASHBURN ET AL TOOTHED CUTTER LI P Filed y 28. 1921 Patented Aug.5, 1924.

UNITED STATES PATENT, on-ics.

nowm e. WASHBUBN, LAFAYETTE e. JOHNSON, am) Josnnrn. 'IEILL, or FLATRIVER, MISSOURI, ASSIGNOBS TO AMERICAN IANGANESE STEEL COMPANY, OF

CHICAGO, ILLINOIS, A CORPORATION OF MAINE.

Application filed Kay 28,

To allwhom it may co'rwem:

Be it known that we, HOWARD G. WASH- BURN, LAFAYE'ITE. G. JOHNSON, andJosnrn R. THILL, citizens of the United States, residing at Flat River,in the State of Missouri, have invented certain new and usefulImprovements in Toothed Cutter Lips, of which the following is aspecification.

Our invention relates to diggin buckets or dippers, and has particularre erence to a cutting lip therefor. v

The invention relates to a cutting lip for excavating machines, whichmay be used with such excavating apparatus as steam shovel dippers,ladder dredge buckets, clam shell buckets and the like, and wherereference is made hereinafter to digging buckets all of'the' above areto be understood as included broadly in this term. 1

An object of our invention is to provide a cutter lip for diggingbuckets which is formed from a single casting and in which there areformed digging teeth, or points,

7 with reinforcing lips and a web construction between the points forthe purpose of strengthening the lip.

Another object of our invention is to provide a cutter lip for diggingbuckets havin digging teeth formed therein.

i further object of our invention is to provide a tooth digging orcuttin lip, of the described character, in which t e teeth are connectedby webs for eliminating breakage.

A still further object of the invention is to provide a cutter 11phaving digging teeth or points integrally formed and in which there isused a web construction for connecting the teeth to aid in distributingstrain over the lip whenever obstructions are encountered in digging.

A still further object is to improve cuttin lips for digging buckets forsuccessful commercial use.

The above and other objects will be apparent from the followingspecification and drawings, and will be particularly pointed out in theappended claims.

In the drawings Fig. 1 is a top plan view of the preferred embodiment ofthe invention.

1921. seria mo. 473,310.

Fig. 2 is a vertical section taken .on line 2-2 of Fig. 1. V

Fig. 3 is a rear end view of the arrangement of Fig. 1.

Fig. 4 is a transverse section on line 4-4 of Fig. 1. i

Fig. 5 is a transverse section on line 5-5 of Fig. 1.

Fig. 6 is a side elevation looking at the left-hand end of Fig. 1.

Fig. 7 is anenlarged fragmentary view showing the preferred constructionof bolt holes, and Fig. 8 is a section taken on line 88ofFi .1. i

The re erence character 10 designates generally the toothed cutter lipof our invention. As shown, the lip comprises an upper surface 11 whichis secured to a digging bucket of any well known form and shape. Boltholes 12 are provided through which bolts, rivets or similar means maybe emplo ed to fasten the lip to a bucket. At each side of the lip thereare upstanding side portion 13-14 for preventing lateral displacement ofthe lip when secured to a bucket and wearin service. Forwardly of theflat surface 11 is What may be termed the digging portion of the lip.Referring to Figs. 4, 5 and 6 of the drawing, it will be noted that thedigging portion is inclined downwardly, forming a cutting ed e.Extendinglongitudinally of the lip,t at is, in the direction of thedigging movement,-there are formed a plurality of ribs 15 which are castwith the lip, the forward ends of which ribs are pointed as at 16 inFig. 4. The pointed portions of the ribs are in efiect digging teeth orpoints. i

For strengthening the digging portion of the lip webs 17 are castconnecting the several ribs 15 and side portions of the lip. The frontedges of the webs are sharpened or pointed as at 18 in Fig. 5 so thatthe whole digging front of the lip is pointed or sharpened for purposeswell understood.

In Fig. 7 there is disclosed countersunk and counterbored holes for thereception of rivets or other attaching means. We'prefer to employ boltholes of this character so that the li may be securely fastened to thedipperbo y and so that the rivets or other the outer or wearing surfacesof the ribs.

Our construction improves digging lipsfor use with digging buckets bycasting the digging point or teeth integrally with the lip, and byproviding connecting webs between the teeth, the lip is strengthened andthe likelihood of a tooth being broken in service is eliminated.Furthermore, by relieving the cutting edge,that is, by the novel pointand web construction of the invention, as shown in the drawings,-diggingis made easier than if a plain or straight lip were used. Furthermore,by provision of the longitudinally extending ribs, the front ends ofwhich form the digging teeth, the lip is stren hened and reinforcedconsiderably. urthermore, digging strains are distributed throughout thewhole casting.

While we have described more or less precisely the details ofconstruction of our invention, we do not wish to be understood aslimiting ourselves thereto, as we contemplate changes in form and theproportion of parts and the substitution of equivalents as circumstancesmay suggest or render expedient, without departing from the spirit ofour invention.

e claim:

1. A one-piece cutter lip for digging buckets having a plurality oflongitudinally extending ribs spaced apart on its under side andterminating in pointed digging teeth at their forward ends.

2. A one-piece cutter lip for digging buckets having a plurality oflongitudinally extending ribs spaced apart on its under side andterminating in downwardly inclined digging teeth at their forward ends.

3. A one-piece cutter lip for digging buckets having upstanding sideportions and a plurality of ribs spaced apart between said side portionsand parallel therewith, and terminating in digging teeth at theirforward ends.

4. A one-piece cutter lip for digging buckets having a plurality oflongitudinal ribs spaced apart and connected by webs to form asubstantially fluted underside, and

said ribs terminating in digger points at their forward ends.

5. A one-piece cutter lipfor digging buckets having a plurality oflongitudinal ribs spaced apart and connected by Webs and forming afluted underside, said ribs being pointed to form digger points at theirforward ends, and said webs being sharpened at their forward ends.

Signed at Flat River, Missouri, this 28th day of April, A. D. 1921.

HOWARDG. WASHBURN. LAFAYETTE G. JOHNSON. JOSEPH R. THILL.

